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(No Mode-1.)

R. E. PBNNER.,

ELECTRIC ARG LAMP.

180.882,42'1. y. Patented Maly 8, 1888.

.24771/20?" neg/S N PETERS. Phnm-uxhagpher, washington. D. c.

UNITED STATES PATENT OFFICE.

RICHARD FENNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO CHARLES K. GILES, OF SAME PLACE.

ELECTRIC-ARC LAM P.l

SPECIFICATION forming pari; of Letters Patent No. 382,421, dated May 8, 1888.

Application filed February 17,1886. Serial No. 192,305. (No model.)

.To all whom vif may concern: Beit known that I, RICHARD E. FENNER, a citizen of the United States, residing at Chicago, in the 'county of Cook and State of Illinois, have invented a certain new and useful Improvement in Electric-Arc Lamps, which is fullysetforth in the following specification, reference being had to the accompanying drawings, in whicha Figure l is an elevation of a lamp embodying my invention; Fig. 2, a detail plan section of the same, taken on the line .fr :1: of Fig. l; Fig. 3, a detail plan section taken on the line y y of Fig. 1, and Fig. 4 a central vertical sectional view taken on a plane corresponding to the line z z of Fig. 2.

Like letters refer to like parts in all the tig ures of the drawings.

My invention relates to electric-arc lamps,

its object being to provide a lamp which shall be simple in construction and effective in op eration, and which may be produced at a minimum cost; and to these ends my invention consists in certain novel features, which I will now proceed to describe, and will then particularly point out in the claim. 4

In, the. drawings, A represents the upper part of the frame, which consists, essentially, of

the uprights or posts a, and of the top crossbar, a', and bottom cross-bar, a?. The lower portion of this frame consists of a yoke, B, provided with a clamping device, b, toreceive the lower carbon, B. This yoke is connected to the upper portion, A, of the frame, but is insulated therefrom, this connection being preferably effected inthe manner shown in Fig. 4 of the drawings, in which the upper threaded ends of the yoke are shown as passing through suitable enlarged apertures in the cross-bar ci, being held in position by nuts b', between which and the crossbar washers or gaskets b2, of hard rubber or other suitable in sulating material, are inserted. The upper carbon, B2, is secured by means of a clamping device, c, of suitable construction, to the lower end of a rod, C, of any desired length.

D indicates a sleeve or tube, through which the rod C passes loosely. This sleeve extends down through a suitable aperture in the lower cross .-bar, a, its lower extremity being threaded at this point to receive two collars,l D and D2, arranged the former above and the latter below the said cross-bar to limit the motion of the sleeve, for the purposes hereinafter stated. These collars may be supplied with set-screws d, if desired, in order to secure the same rigidly in position on the sleeve and prevent any accidental displacement of the same after adjustment. y

It will be observed that the sleeve D is of considerable length, extending, asit does, from the armature of the magnet down through the cross-bar a, whereby an elongated bearing and support is provided for the carbon-sup' porting rod C.

E indicates an electromagnet secured to the upper cross-bar, a', of thc upper portion, A, of the frame.

E represents the armature or keeper of this magnet, the said armature being so mounted as to move freely in a vertical direction, being supported and guided by means of the rod C, which passes freely through it, and by means of the uprights a, as shown in detail in Fig. 2 of the drawings. To the outer ends of this armature are pivoted arms F, the lower ends of which are in turn piv-oted to the grippinglevers G. These grippinglevers are pivoted between lugs d on the sleeve D, which latter is provided at these points with slots di, in which the inner ends of the gripping-levers G are arranged. The said inner ends of these levers are formed by means of a toe or proj ection, G', as shown in detail in Fig. 4 of the drawings, the said projection being capable of being projected inward through the slots di to bear against and grip the rod C when the outer ends of the gripping-levers are raised.

The operation of the mechanism is as follows: The current passes by means of the wire 1 through the coils of the electro-magnet E, which, it will be thus seen, is arranged in the circuit. From the coils of the magnet the current passes by means of the wire 2 to one of the uprights a of the upper portion, A, ofthe frame, and thence through the rod C, carbon B2, carbon B', yoke B, and out by means of the wire 3. The current being thus estab` lished, the electro-magnet E attracts the armaturc E', which latter, by means of the arms or roo links F, raises the outer ends ol the grippinglevers G. 'The inner ends ot' these levers are thereby Caused to grip the rod C and lift the saine along with the carbon L, thus establishing the are. rlhe upward motion ofthe rod C and the carbon which it carries is limited by means oi' the lower collar, Dl, on the sleeve D, whiehis of course carried upward by the upward movement oi' the armature E. It is obvious that as the earbons burn away the niagnetie action of the electro-magnet diminishes and the armature moves downward in a eer responding degree, thus loosening the grip on the rod and allowing this latter and the earbon to descend by their own weight, maintaining a proper separat-ion ol' the earbons. This sliding ol" the rod does not, of Course, take place, however, until the upper collar, D', on the sleeve D rests upon the lower bnr, a. 'In continued operation this is the normal position of the clamp, the oliiee oi' the electro-magnet being to regulate the sliding of the rod through the gripping-levers. Il', however, the rod aeeidentally slides too far, it will be antoinatiA cally raised again andthe Carbon points maintained in proper relation.

H represents a metallic plate bent around one of the arms ofthe electromagnet, and

bearing with one end against one of the uprights ci and with the other end against the rod G, for the purpose ol' forming a more eornplete eleetrieal eoinninnieation between the frame and the rod. This plate may be o1nitted, however, il desired, although I prefer to employ it.

lt is obvious that various modileations iu the details of construction may be made withont deparingl'roin the principle of myinven tion, and I therefore do not wish to be under' stood aslimiling myself strictly to the precise details hereinbel'ore described, and shown in the drawings. v

Having thus described my invention, what I elaim as new, and desire to seenre by Letters Patent, is-

The Combination, with the earbonsupporting rod C, of the sleeve D, provided with ad justable stops or collars D D2, the grippinglevers G, pivoted to the said sleeve, the links 1*,pivoi'ed tothe gripping-lever, the armature, and the electro-magnet E, snbstantiall'iY as and for the purposes speeilied.

RICHARD ll. FENNER. Witnesses:

LEONARD WivrsoN, Invinn iliiriipian. 

